CN1654298A - Re-flatting method and system for traction type elevator - Google Patents
Re-flatting method and system for traction type elevator Download PDFInfo
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- CN1654298A CN1654298A CN 200510033191 CN200510033191A CN1654298A CN 1654298 A CN1654298 A CN 1654298A CN 200510033191 CN200510033191 CN 200510033191 CN 200510033191 A CN200510033191 A CN 200510033191A CN 1654298 A CN1654298 A CN 1654298A
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Abstract
The present invention is story re-aligning method and system for dragged elevator, and relates to elevator control. The system includes story aligning inductor, controller, hydraulic driver, hydraulic unit and power source. The story aligning inductor similar to available one is installed on the top of the cage, guide tracks in the well or wall; the controller is connected to the story aligning inductor and the hydraulic driver; the hydraulic driver is connected hydraulically with the hydraulic unit; and the end board of the cage dragging steel cable is fixed onto the piston of the hydraulic unit. The method and system of the present invention makes elevator even safe.
Description
Technical field
The system of flat bed again that the present invention relates to a kind of traction elevator re-flatting method and use this method belongs to the control field of elevator.
Background technology
When moving, following situation takes place in regular meeting at the traction elevator that exchanges (double speed) heavy amount: 1, behind the car flat bed, when propelling or release weight, the lift car flat bed is changed; 2, the elevator that is loaded with weight pulls in operation upwards, and can flat bed to occur inaccurate; 3, because control contactor makes that drg (the being band-type brake) adhesive of elevator traction machine is untimely, also can cause leveling error.This all uneven layer phenomenon all can be given to transport goods and be made troubles, when serious in addition the personnel that can cause injure.
For this reason, people have proposed multiple solution to this situation.For example: the Inventio AG of Switzerland has proposed publication number and has been: the device of at least one car layer accurate level location of a kind of multilayer car to elevator of CN1442357A, lower floor has one and is used for the platform actuating device that accurate level is located in the multilayer car described in this device.The car layer floor that plays platform action can and utilize the actuator of platform actuating device to realize moving up and down around the S. A. rotation.Car layer bank is provided with sensor, and described sensor carries out location to the mark that is arranged on the floor ridge.When sensor arrives when surpassing mark before the multilayer car stops layer, the platform actuating device is activated before the arrival floor anchor point on the contrary service direction of multilayer car, until reaching sensor and be marked on the sustained height, thereby reaches the function of flat bed.
At present, traction elevator will have story-leveling function again, mainly by adopting the variable-frequency driving technique to reach, when elevator trigger of frequency converter motor increasing torsion during flat bed not, reaches flat bed purpose again by traction.But above-mentioned these technical schemes have the following disadvantages: the equipment base price of frequency-changing elevator is expensive; The elevator of different load carrying abilities is joined the frequency converter of different capacity, and narrow application range and price variance are big; Do not impose on the power of motor during flat bed, big to the loss of electric machine, accelerate the wearing and tearing of traction steel-cable and traction race simultaneously, flat bed increases energy consumption and also increases electric weight simultaneously more repeatedly; To open the elevator band-type brake during flat bed again, increase safety hazard; It is exactly the load that the weight that increased car increases the weight of system.
Summary of the invention
The purpose of this invention is to provide a kind of equipment price is low, do not adopt converter technique elevator re-flatting method and device for this reason;
Another object of the present invention provides a kind of applied widely, re-flatting method and device of going for different dead-weight capacity elevators;
Another object of the present invention provides a kind of low energy consumption, power saving, can not disturb the elevator re-flatting method and the device of electrical network;
Elevator safety loop cut off when another object of the present invention provided a kind of flat bed again, the re-flatting method and the device of working under the situation of the static safe internal contracting deadlock of elevator motor;
Another object of the present invention provides a kind of method and apparatus that is implemented in flat bed with hydraulic efficiency gear.
For achieving the above object, the present invention proposes following technical scheme:
A kind of traction elevator re-flatting method, this method comprises: the rope hitch plate of car traction steel-cable is fixed on the piston of hydraulic efficiency gear; The flat bed inductor detects the flat bed situation of car; The information of flat bed situation is reached controller; Controller is according to the action of flat bed information Control hydraulic efficiency gear, to reach lift car flat bed again.
When elevator when flat bed is inaccurate again, can adjust the distance of flat bed position of inductor and hydraulic efficiency gear upper stroke switch, making again, the flat bed process reaches accurate level.
When lift car during at accurate level position, controller detects 2 flat bed signals that obtain according to the flat bed inductor, send the signal that elevator safety loop can not conducting to apparatus for controlling elevator, make the elevator signal blocker of closing the door, elevator remains under the door opening state and does not move, this moment the re-packing and keep middle operating switch always of travel switch by at three travel switches, the inoperative fluid pressure drive device of controller also makes the hydraulic efficiency gear maintenance motionless.
When after elevator stops layer, not meeting the flat bed requirement, controller according to the flat bed inductor detect 1 flat bed signal, send the signal that elevator safety loop can not conducting to apparatus for controlling elevator, make the elevator signal blocker of closing the door, elevator remains under the door opening state and does not move, re-pack this moment keeps middle operating switch by at three travel switches always, and controller primer fluid hydraulic driver send/take out hydraulic fluid, promotes hydraulic efficiency gear and moves and make car flat bed once more;
Re-pack leave the middle operating switch of three travel switches after, with after obtaining the flat bed inductor and detecting the flat bed signal that lacks obtain, reach to flat bed accurately as car, on the hydraulic efficiency gear/the action safety distance is to re-pack by in the spacing scope of last/lower stroke switch down.
A kind of traction elevator hydraulic pressure is the flat bed system again, and this system comprises: the flat bed inductor of former Elevator landing system; Controller; Fluid pressure drive device; Hydraulic efficiency gear and power supply, wherein said flat bed inductor is the original flat bed system of elevator, be mounted on the car roof and hoistway in rail brackets or wall on, controller links to each other with actuating device with the flat bed inductor, actuating device is connected with hydraulic efficiency gear power; The rope hitch plate of car traction steel-cable is fixed on the piston of hydraulic efficiency gear.
Described flat bed inductor is original flat bed induction system of elevator, is made up of upper and lower two flat bed inductor magnetic switchs and floor magnetic isolation plate; Described flat bed inductor magnetic switch is fixed on the car, and described floor magnetic isolation plate is to be fixed on rail brackets in the hoistway or the wall.
On the fluid pressure drive device re-pack by with the work that contacts the modulated pressure oil pump and the up and down scope of three travel switches, again by hydraulic oil pumping/take out hydraulic fluid, drive oil cylinder piston work in the hydraulic efficiency gear, thereby the lifting/lowering of drive car traction rope hitch plate is realized the microspur flat bed of car.
Stop layer in the langding accuracy scope time at elevator, the magnetic isolation plate in the hoistway is to cut in the middle of two magnetic switchs, re-packs this moment to keep middle operating switch by at three travel switches always, and hydraulic oil pump and car all remain static.
When after elevator stops layer, exceeding the flat bed requirement, magnetic isolation plate in the hoistway is only to cut in following magnetic switch, re-pack this moment keeps middle operating switch by at three travel switches always, and elevator safety loop can not conducting, and hydraulic oil pump begins pressure release till car drops to flat bed; Re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect behind the flat bed signal that lacks, reach to flat bed accurately as car.
When after elevator stops layer, being lower than the flat bed requirement, magnetic isolation plate in the hoistway is only to cut on top in the magnetic switch, re-pack this moment keeps middle operating switch by at three travel switches always, and elevator safety loop can not conducting, and hydraulic oil pump begins supercharging till car rises to flat bed; Re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect behind the flat bed signal that lacks, reach to flat bed accurately as car.
Technique scheme is owing to be to adopt the original flat bed induction of elevator magnetic switch, three stroke contact switches etc., improved system stability, reduced cost, improved antijamming capability; Adopt fluid control to improve load carrying ability, use oil pump motor to realize low power, electrical network is not disturbed, make the operation of elevator safer.
Description of drawings
The too high situation of car when Fig. 1 a, 1b are depicted as elevator and stop layer;
Fig. 2 a, 2b are depicted as the situation that elevator accurately stops layer;
The low excessively situation of car when Fig. 3 a, 3b are depicted as elevator and stop layer;
Figure 4 shows that the hydraulic efficiency gear scheme drawing;
Figure 5 shows that traction ratio is 2: 1 an elevator flat bed system schematic again;
Figure 6 shows that traction ratio is 4: 1 an elevator flat bed system schematic again.
The specific embodiment
As shown in Figure 5 and Figure 6, no matter it is 2: 1 also 4: 1, or even the traction-type heavy elevator of higher traction ratio, cause that the not flat bed of elevator in door district scope has multiple reason, no matter be to produce leveling error under which kind of situation, elevator hydraulic pressure proposed by the invention flat bed system again can both make elevator return to meet the perfect precision that GB requires.
Behind the elevator operation access door district flat bed first time, by being installed in the inductor of flat bed again 9 in the elevator hoistways, wherein going up flat bed inductor magnetic switch 18 and following flat bed inductor magnetic switch 17 is fixed together and is installed on the car 3,19 of magnetic isolation plates in the flat bed inductor 9 are fixed on the hoistway interior rail brackets or wall again, displacement difference after flat bed inductor 9 is tested Elevator landing again (in ± 100mm) signal feeds back to the electric control system 11 of hydraulic relevelling device.When flat bed has error, force the hydraulic oil pump 15 in the elevator(lift) machine room to start.And the rope hitch plate 2 of oil cylinder piston drive car traction steel-cable is moved up and down, so that give car, reach requirement up to Elevator landing by the traction steel-cable power transmission.
No matter traction elevator moves to leveling zone up or down, and the band-type brake adhesive is stopped and opened the door, and elevator keeps door opening state, and the Room, car door safety return circuit disconnect.At this moment according to Fig. 1, Fig. 2, shown in Figure 3: elevator has three kinds of flat bed situations, first kind of car door 7 alignment that situation is Room door 6 and car 3; Second kind of situation is that the car door 7 of car 3 is higher than Room door 6 when stopping layer; Situation is that the car door 7 of car 3 is lower than Room door 6 in the 3rd; Hydraulic pressure of the present invention flat bed system again has three kinds of cooresponding mode of operation:
First kind of situation, shown in Fig. 2 a and Fig. 2 b, when elevator stops layer in the langding accuracy scope, be that the interior magnetic isolation plate 19 of hoistway is just in time cut the centre at two magnetic switchs 17,18, re-packing on the machine room oil cylinder limit keeps by the middle operating switch 16 at three travel switches always, at this moment hydraulic oil pump 11 does not start, and lift car 3 remains static, if just this moment elevator have calling signal to close the door to move behind the conducting safety return circuit at once.
Second kind of situation, shown in Fig. 1 a and Fig. 1 b, after stopping layer, elevator exceeds the flat bed requirement, and promptly magnetic isolation plate 19 is cut in following magnetic switch 17 in the hoistway, and breaking away from top magnetic switch 18, re-packing on machine room oil cylinder 15 limits keeps by the middle operating switch 16 at three travel switches always.At this moment send elevator safety loop by hydraulic pressure electrical control cabinet 12 and can not Continuity signal give elevator control cabinet (apparatus for controlling elevator), make the elevator signal blocker of closing the door, elevator can not move.Hydraulic oil pump 11 begins to carry out pressure release simultaneously, thereby making oil cylinder piston operation downwards drive car traction rope hitch plate 2 positions trace descends, re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect the flat bed signal of the top magnetic switch 18 that lacks after, reach to flat bed accurately as car, all return to " first kind of situation " simultaneously.
The third situation shown in Fig. 3 a and Fig. 3 b, is lower than the flat bed requirement equally after elevator stops layer, magnetic isolation plate 19 is cut on top in the magnetic switch 18 in the hoistway, and breaks away from following magnetic switch 17.Re-packing on machine room oil cylinder 15 limits keeps by the middle operating switch 16 at three travel switches always.At this moment hydraulic pressure electrical control cabinet 12 sends the elevator safety loop shutoff signal and gives elevator control cabinet 10, makes the elevator signal blocker of closing the door, and elevator can not move.Hydraulic oil pump 11 superchargings simultaneously, force the oil cylinder piston upward movement, trace rises thereby microspur promotes car traction rope hitch plate 2 positions, re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect the flat bed signal of the following magnetic switch 17 that lacks after, reach to flat bed accurately as car, all return to " first kind of situation " simultaneously.
Figure 4 shows that the hydraulic efficiency gear scheme drawing, wherein whole hydraulic efficiency gear is installed on the floor 21, hydraulic efficiency gear has the framework 13 of hydraulic efficiency gear, framework 13 is provided with travel switch assembly 16 and oil cylinder 15, at oil cylinder 15 oil cylinder is installed and connects support 14, be fixed with fag end adapter plate 2 on the oil cylinder connection support 14, the fixed end of traction steel-cable 5 just is fixed on the fag end adapter plate.As shown in Figure 4, the stroke range 20 of travel switch assembly 16.When fluid pressure drive device 11 drove hydraulic ram 15 actions, hydraulic ram 15 drove oil cylinder and connects support 14 actions, thereby microspur moves fag end adapter plate 2, thereby reached the lift car purpose of flat bed again.
In Fig. 5 and Fig. 6, two kinds of different elevator devices of traction ratio have then been provided.But these two kinds of elevator devices different only be the traction ratio difference, the principle of flat bed is the same with elevator device again.Elevator device all comprises elevator control cabinet 10, traction motor 1, diversion sheave 8 and be wrapped in traction motor 1 and diversion sheave 8 on steel rope 5, the two ends of steel rope 5 all are fixed on the fag end adapter plate 2, car 3 and counterweight 4 symmetries are suspended on the both sides of traction motor 1 by steel rope 5.Hydraulic pressure again the electrical control 12 of flat bed system respectively at being electrically connected between hydraulic oil pump assembly 11 and the elevator control control housing 10, with control that realizes again flat bed and the safe in operation of guaranteeing elevator.
Above-listed detailed description is specifying at possible embodiments of the present invention, only this embodiment is not in order to limit claim of the present invention, allly do not break away from equivalent embodiment or the change that skill spirit of the present invention is done, for example, equivalence embodiment Deng changing all should be contained in the claim of this case.
Claims (10)
1, a kind of traction elevator re-flatting method, this method comprises:
The rope hitch plate of car traction steel-cable is fixed on the piston of hydraulic efficiency gear;
The flat bed inductor detects the flat bed situation of car;
The information of flat bed situation is reached controller;
Controller is according to the action of flat bed information Control hydraulic efficiency gear, to reach lift car flat bed again.
2, method according to claim 1, wherein:
When elevator when flat bed is inaccurate again, can adjust the distance of flat bed position of inductor and hydraulic efficiency gear upper stroke switch, making again, the flat bed process reaches accurate level.
3, method according to claim 1 and 2, wherein:
When lift car during at accurate level position, controller detects 2 flat bed signals that obtain according to the flat bed inductor, send the signal that elevator safety loop can not conducting to apparatus for controlling elevator, make the elevator signal blocker of closing the door, elevator remains under the door opening state and does not move, this moment the re-packing and keep middle operating switch always of travel switch by at three travel switches, the inoperative fluid pressure drive device of controller also makes the hydraulic efficiency gear maintenance motionless.
4, method according to claim 1 and 2, wherein:
When after elevator stops layer, not meeting the flat bed requirement, controller according to the flat bed inductor detect 1 flat bed signal, send the signal that elevator safety loop can not conducting to apparatus for controlling elevator, make the elevator signal blocker of closing the door, elevator remains under the door opening state and does not move, re-pack this moment keeps middle operating switch by at three travel switches always, and controller primer fluid hydraulic driver send/take out hydraulic fluid, promotes hydraulic efficiency gear and moves and make car flat bed once more;
Re-pack leave the middle operating switch of three travel switches after, with after obtaining the flat bed inductor and detecting the flat bed signal that lacks obtain, reach to flat bed accurately as car, on the hydraulic efficiency gear/the action safety distance is to re-pack by in the spacing scope of last/lower stroke switch down.
5, a kind of traction elevator hydraulic pressure flat bed system again, this system comprises:
The flat bed inductor of former Elevator landing system;
Controller;
Fluid pressure drive device;
Hydraulic efficiency gear and power supply, wherein said flat bed inductor is the original flat bed system of elevator, be mounted on the car roof and hoistway in rail brackets or wall on, controller links to each other with actuating device with the flat bed inductor, actuating device is connected with hydraulic efficiency gear power;
The rope hitch plate of car traction steel-cable is fixed on the piston of hydraulic efficiency gear.
6, system according to claim 5, wherein:
Described flat bed inductor is original flat bed induction system of elevator, is made up of upper and lower two flat bed inductor magnetic switchs and floor magnetic isolation plate;
Described flat bed inductor magnetic switch is fixed on the car, and described floor magnetic isolation plate is to be fixed on rail brackets in the hoistway or the wall.
7, system according to claim 5, wherein:
On the fluid pressure drive device re-pack by with the work that contacts the modulated pressure oil pump and the up and down scope of three travel switches, again by hydraulic oil pumping/take out hydraulic fluid, drive oil cylinder piston work in the hydraulic efficiency gear, thereby the lifting/lowering of drive car traction rope hitch plate is realized the microspur flat bed of car.
8, according to claim 5,6 or 7 described systems, wherein:
Stop layer in the langding accuracy scope time at elevator, the magnetic isolation plate in the hoistway is to cut in the middle of two magnetic switchs, re-packs this moment to keep middle operating switch by at three travel switches always, and hydraulic oil pump and car all remain static.
9, according to claim 5,6 or 7 described systems, wherein:
When after elevator stops layer, exceeding the flat bed requirement, magnetic isolation plate in the hoistway is only to cut in following magnetic switch, re-pack this moment keeps middle operating switch by at three travel switches always, and elevator safety loop can not conducting, and hydraulic oil pump begins pressure release till car drops to flat bed;
Re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect behind the flat bed signal that lacks, reach to flat bed accurately as car.
10, according to claim 5,6 or 7 described systems, wherein:
When after elevator stops layer, being lower than the flat bed requirement, magnetic isolation plate in the hoistway is only to cut on top in the magnetic switch, re-pack this moment keeps middle operating switch by at three travel switches always, and elevator safety loop can not conducting, and hydraulic oil pump begins supercharging till car rises to flat bed;
Re-pack leave the middle operating switch of three travel switches after, with obtain the flat bed inductor detect behind the flat bed signal that lacks, reach to flat bed accurately as car.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100331912A CN100448768C (en) | 2005-02-04 | 2005-02-04 | Re-flatting method and system for traction type elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100331912A CN100448768C (en) | 2005-02-04 | 2005-02-04 | Re-flatting method and system for traction type elevator |
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| CN1654298A true CN1654298A (en) | 2005-08-17 |
| CN100448768C CN100448768C (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100331912A Expired - Fee Related CN100448768C (en) | 2005-02-04 | 2005-02-04 | Re-flatting method and system for traction type elevator |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730506A (en) * | 2012-06-29 | 2012-10-17 | 日立电梯(上海)有限公司 | Method for positioning elevator in out-of-control state |
| CN103072865A (en) * | 2013-01-18 | 2013-05-01 | 西继迅达（许昌）电梯有限公司 | Elevator re-leveling method and system |
| CN103538985A (en) * | 2013-10-29 | 2014-01-29 | 江南嘉捷电梯股份有限公司 | Elevator emergency rescue device |
| CN104291176A (en) * | 2014-11-05 | 2015-01-21 | 康力电梯股份有限公司 | Hydraulic type safety releveling device for elevator |
| CN104314341A (en) * | 2014-10-24 | 2015-01-28 | 四川科莱立泊停车设备有限公司 | Releveling mode for vertical-lifting-type three-dimensional garage |
| CN104326321A (en) * | 2014-11-05 | 2015-02-04 | 康力电梯股份有限公司 | Elevator screw type safe releveling device |
| CN106185518A (en) * | 2016-09-26 | 2016-12-07 | 西继迅达（许昌）电梯有限公司 | A kind of elevator fluid pressure type safety leveling device again |
| CN106241527A (en) * | 2016-05-18 | 2016-12-21 | 通力电梯有限公司 | Elevator |
| CN106241528A (en) * | 2016-05-18 | 2016-12-21 | 通力电梯有限公司 | Elevator |
| CN106800225A (en) * | 2017-02-23 | 2017-06-06 | 深圳市海浦蒙特科技有限公司 | Elevator returns flatting method |
| CN108726297A (en) * | 2017-04-14 | 2018-11-02 | 上海三菱电梯有限公司 | Elevator landing detection device |
| CN110589643A (en) * | 2019-08-15 | 2019-12-20 | 广东工业大学 | Elevator car re-leveling control system and implementation method thereof |
| CN110723611A (en) * | 2014-02-06 | 2020-01-24 | 奥的斯电梯公司 | Brake operation management in an elevator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FI125336B (en) * | 2012-10-31 | 2015-08-31 | Kone Corp | Lift arrangement |
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| JPH08231147A (en) * | 1995-02-24 | 1996-09-10 | Toshiba Corp | Elevator landing error monitor |
| JP3268483B2 (en) * | 1995-05-16 | 2002-03-25 | 株式会社日立製作所 | Elevator control device |
| JPH09142747A (en) * | 1995-11-21 | 1997-06-03 | Hitachi Ltd | Drive device for hydraulic elevator |
| JP3263358B2 (en) * | 1998-03-13 | 2002-03-04 | 太陽鉄工株式会社 | Position adjustment device for cage of rope type elevator |
| JPH11343077A (en) * | 1998-06-01 | 1999-12-14 | Hitachi Ltd | Control device for hydraulic elevator |
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- 2005-02-04 CN CNB2005100331912A patent/CN100448768C/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730506A (en) * | 2012-06-29 | 2012-10-17 | 日立电梯(上海)有限公司 | Method for positioning elevator in out-of-control state |
| CN103072865A (en) * | 2013-01-18 | 2013-05-01 | 西继迅达（许昌）电梯有限公司 | Elevator re-leveling method and system |
| CN103538985A (en) * | 2013-10-29 | 2014-01-29 | 江南嘉捷电梯股份有限公司 | Elevator emergency rescue device |
| CN103538985B (en) * | 2013-10-29 | 2016-02-24 | 江南嘉捷电梯股份有限公司 | A kind of emergency rescue device for elevator |
| CN110723611B (en) * | 2014-02-06 | 2022-04-12 | 奥的斯电梯公司 | Brake operation management in an elevator |
| CN110723611A (en) * | 2014-02-06 | 2020-01-24 | 奥的斯电梯公司 | Brake operation management in an elevator |
| CN104314341A (en) * | 2014-10-24 | 2015-01-28 | 四川科莱立泊停车设备有限公司 | Releveling mode for vertical-lifting-type three-dimensional garage |
| CN104314341B (en) * | 2014-10-24 | 2016-08-31 | 四川科莱立泊停车设备有限公司 | A kind of again flat bed mode of vertical lift type multi-storied garage |
| CN104291176A (en) * | 2014-11-05 | 2015-01-21 | 康力电梯股份有限公司 | Hydraulic type safety releveling device for elevator |
| CN104326321A (en) * | 2014-11-05 | 2015-02-04 | 康力电梯股份有限公司 | Elevator screw type safe releveling device |
| CN106241528B (en) * | 2016-05-18 | 2018-06-26 | 通力电梯有限公司 | Elevator |
| CN106241528A (en) * | 2016-05-18 | 2016-12-21 | 通力电梯有限公司 | Elevator |
| CN106241527B (en) * | 2016-05-18 | 2018-10-02 | 通力电梯有限公司 | Elevator |
| CN106241527A (en) * | 2016-05-18 | 2016-12-21 | 通力电梯有限公司 | Elevator |
| CN106185518A (en) * | 2016-09-26 | 2016-12-07 | 西继迅达（许昌）电梯有限公司 | A kind of elevator fluid pressure type safety leveling device again |
| CN106800225A (en) * | 2017-02-23 | 2017-06-06 | 深圳市海浦蒙特科技有限公司 | Elevator returns flatting method |
| CN108726297A (en) * | 2017-04-14 | 2018-11-02 | 上海三菱电梯有限公司 | Elevator landing detection device |
| CN108726297B (en) * | 2017-04-14 | 2020-09-22 | 上海三菱电梯有限公司 | Elevator flat bed detection device |
| CN110589643A (en) * | 2019-08-15 | 2019-12-20 | 广东工业大学 | Elevator car re-leveling control system and implementation method thereof |
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| CN100448768C (en) | 2009-01-07 |
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